Google.org has publicized a $4.4 trillion plan to wean the United States off fossil fuels by 2030.

Google calls in the proposal for a 38-percent cut in oil used for vehicle fuel.

“Technologies and know-how to accomplish this are either available today or are under development,” the proposal, by Jeffery Greenblatt, says.

It also urges greater use of nuclear, solar, wind and geothermal sources of power.

According to Google, the plan would cost about $4.4 trillion but over 22 years would save a net of about $1 trillion while creating new jobs.

The details of the plan call for:

Improved electrical energy efficiency, which will counteract growth in demand and also the expected demand from plug-in electric cars. Replacing all electrical power generation that uses coal and oil for fuel. About half of electrical generation from natural gas would also be replaced, all with renewable sources like wind — both on and offshore — solar and geothermal.

To achieve these goals, Greenblatt says, the country will have to improve electrical transmission capacity and invest in research to make renewable energy cheap and ubiquitous. Mileage standards for cars will have to be raised, and infrastructure like charging stations for electric vehicles will have to be encouraged and built.

Google’s proposal assumes that electricity demand can be kept flat at the 2008 level, rather than growing by a quarter by 2030. The proposal claims “ample proof” that this is possible, citing research studies and the experience of states, plus a McKinsey & Co. report — Reducing U.S. Greenhouse Gas Emissions: How Much at What Cost, published last December.